Net Revenue - Summary of Disaggregation of Revenue from Contracts with Customers by Product (Detail) - TWD ($) $ in Millions	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	$ 734,555.4	$ 621,295.5
Wafer [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	654,478.0	546,955.8
Other Products [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	$ 80,077.4	$ 74,339.7

The amount of revenue from contracts with customers. A customer is a party that has contracted with an entity to obtain goods or services that are an output of the entity’s ordinary activities in exchange for consideration.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2020-01-01
-Paragraph 113
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_113_a&doctype=Standard
-URIDate 2020-01-01

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2020-01-01
-Paragraph 114
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_114&doctype=Standard
-URIDate 2020-01-01

Name:	ifrs-full_RevenueFromContractsWithCustomers
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration